Improved mill-staff



l diluted "sae-M ffice. Y use@ i atae IMPROVED MILL-STAFF.

The Schedule referred to in these Letters Patent and making part of the'aame.

To all whom 'it may concern full, clearfand exact description thereof, suiiicient to enable those skilled in the art to which my invention appertains, to make and use the same, reference being had to the accompanying drawings, forming-part of this specification, and in which- Figure l is a side view of the staff and spindle;

Figure 2, an inverted plan of the staff; and

Figure 3, a section through the linex x of lig. l, the device being shown applied to a millstone.

My invention is an improved device for detecting inequalities on the grinding-faces of millstones, so as to enable the miller, in dressing the same, to use his pick accurately, as hereinafter more fully described.

The invention consists in providing the staff with a balance-rim, secured over the eye of the staff, and through the top, of which aregulating, or temperscrew works; in the arrangement, within the eye of the staff, of adjustable blocks, operated by means of set-screws; and also in the use of a metallic ring, provided with long and short screws, alternately, for the. purpose of securing said ring in the eye of the sione, and on the spindle, as will hereinafter be more fully set forth.

In order to enable othersto fully understand and make use of my improvements, I will now proceed to describe the same more fully in detail, referring to the accompanying drawings,A in which similar letters indi-f cate like parts in the several figures.

In the drawings- A represents the stan", made usually of wood, and enlarged in the centre, as clearly shown in fig. 2.

B is the eye through the centrey of the enlarged por! tion of the staff.

C, iig. 1, represents a curved metallic strap or yoke, called the balance-rim, secured to the stal` A at the opposite sides of eye B.

Through the centre of this strap G is an opening,va,

formed with a screw-thread, for the passage of a vertical adjusting or temper-screw, D.

The upper end ofthis screwA is flattened, for con venience in turning it, while the lower end is pointed to enter a cavity, formed for its reception, in the upper end of the spindle E.

l1 is a screw-uut fitted on screw D, and resting upon the top of strap C.

In the staff A are formed recesses, c, opening into the eye B, and extending about half-way through the said staf'from the under side.

In each recess c a block, (I, having a concave outer face, is fitted.

e are set-screws, working in holes made through the sides of staff A, the inner end of each screw entering a rec-ess, formed for its reception, in the rear side of a block, d. By means of `thesescrews the blocks d are moved, so as to adjust the staff A.

F represents a broad metallic ring, perforated at equal distances around its periphery, for `the passage of set-screws g h.

The screws g are of the common kind, and are used to hold the ring F on the spindle E. I

Each screw l1. is formed with an extension at its outer end.

These screws are arranged alternately with the screws g, and are adapted to be screwed outward against th. sides of the eye of the millstone, so ,as'to support the ring F, spindle E, and staff A.

When the stad" is used on the bed-stone, the lower end of the screw D is rested upon the top of the millspindle, which occupies the placey of the spindle Ein theaccompanying drawings. 5

When the device is used on the runner-stone, the spindle E is placed inthe eye of the same, and secured, as shown in fig. 3.

The staff having been placed on the spindle, Il'use it first as a trammer to plumb the spindle. This is done by turning the screw D down on the centre of the spindle', and laying the staff A, say, north andsouth. The spindle is` then straightened.

The staff, is now turned to apositiou at right angles to that which it before occupied, as east and west, and the spindle again straightened, so that the screw D will come down on the centre of the top of the spindle. We now have the spindle true to the face-of the stone. The screw D is then turned, so as to raise the stai' off the surfaceof the stone. s

' I nowapply to the stad" a coat of fresh paint, and turn the staff around over the face of the stone. As it turns, it comes in contact' with the unequal projections, and leaves thereon its mark in paint. The miller now proceedswith his pick to remove the inequalities so marked. A

The use of the adjustable blocks d, in the eye of the staff,lis to steady the latter as it turns, so that its under side may always be parallel with the ,face-of' the stone.

Foremost among the advantages of my mill-staff, is its extreme simplicity. As a whole, it is readily applcableand adjustable, while the staff proper is removable, by simply lifting it from the spindle, to make room for the use of the pick.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is Y v '1. The ring F,'provided with the sets of screws g v and h, when the same are constructed and arranged substantially as herein purposes specified.

2. The staff A, with yoke C, screw D, and blocks d, and the ring F, with screws g h, all constructed substantially as described, whenl varranged withrelation to each otherqand to the spindle E, as set forth.

A. ESHELMAN.

shown and described, for the Witnesses:

WM. R., Ruienn,V J. VAN Bunn. 

